Grinding machine



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Patented Oct. 28, 1952 GRINDING Mia i:

Walter S. Klay and Ralph E. Price, Waynesboro,

assignors to Landis Pa., Waynesboro, Pa.

Tool Company,

Application June 6, 1947-, Serial No. 753.142

This invention relates to machine tools particularly to means forsupporting machine tool elements for angular adjustment in a horizontalplane. I I

The usual method ofmountin 'a machine tool element for angularadjustment-in ahorizontal plane is to provide a pivot or trunnion whichdetermines the axis-about which the element is adjusted. The weight ofthe element is usually distributed uniformly over its entire undersurface which rests on a corresponding surface on the base or othersupporting member. When an element is in the desired position, it isusually secured by some suitable looking or clamping When a. change inposition becomes necessary, the clamps are released and the element isshifted to the new position.

Where anelement such as the grinding wheel supportdisclosed herein mustbe so adjusted, the weight involved and the friction between thecontacting surfaces is so great that considerable manual effort isrequired. The greater part of this effort is required to overcomefriction. If friction could be eliminated, the weight may be shiftedmanually without excessive effort on the part of a. workman. Thus, theuse of expensive mechanical or power devices is avoided.

It is therefore an object of this invention to provide an 'angularlyadjustable tool mounting which will have a maximum of rigidity and aminimum of frictional resistance to adjustment.

A further object is to provide means for distributing the weight of thetool support.

A further object is to reduce the area of contacting surfaces bysupporting and locating the support member on a single anti-frictionbearing.

Figure l is a partial sectional front elevation of a, grinding machinehaving a grinding wheel support mounted for adjustment about a verticalaxis.

Figure 2 shows a modified device for supporting the base for swivelling.

Figure 3 shows a second modified method.

In the drawings numeral l indicates the bed of a grinding machine, H anintermediate support member circular in shape and having an upwardlyfacing bearing surface I2 for engaging the bearing surface l3 of slideI'4. Said slide I4 has a V and a flat guide surface I5 and I6respectively spaced apart thereon for slidably supporting a grindingwheelbase 20 for movement toward and away from an operative position.Thus, said grinding wheel may be fed at the angle to which said slide isadjusted.

A grinding wheel 2| is rotatably mounted on said wheel base in anysuitable manner.

2 Claims. (01. ages Numeral 25 indicates a rack" mounted on slide 1 l4and in operative engagement with a pinion 26 which may be drivenby anyof the well known mechanisms to effect movement of .the grinding wheel21 toward and from, and inlgr'indingposition. I

*A member 30 having a recess 3| therein is secured to bed H] by means ofscrews 32. A flanged trunnion member 33 isinserted in: said recess, inWhich it may be adjusted vertically by means of an adjusting screw 34.The'purpose of this adjustment is. to vary the load on resilient washas,also. known as Belleville springs.

Said springs are placed around trunnion33 and rest on the flangethereof. The inner'ring 36v of-a tapered roller bearing is placed/onvsaid trunnionon top of saidsprings.

A circularplate 40 having a narrow annular surface 4| thereon forengaging the underside of slidel' i is secured to-saidslide by screws42. Said plate has an inverted recess 43 on its underside shaped toreceive a roller bearing outer ring 44 against a shoulder 45. The outerportion of said recess overlaps member 30 so as to prevent moisture anddirt from entering the bearing.

During a grinding operation, surface I3 of slide I4 is clamped by anysuitable device to surface 12 of support member H to provide therigidity necessary for the grinding wheel. During said grindingoperation, when said surfaces are clamped together, a load is placed onsprings 35 through the bearing members 36, 44 and 46. Said loa-d may beadjusted by means of screw 34. When surfaces I2 and I3 are unclamped,springs 35, acting through said bearing members and plate 40, will liftslide I4 enough to take the load off said surfaces. Slide l4 and thewheelbase 20 will then be entirely supported on bearing rollers 46. Saidslide may then be adjusted angularly with a minimum of effort. Thetapered bearing not only supports the weight of the wheelbase, but alsokeeps it properly centered on the bed.

In Figure 2 is shown a modified version of the device shown in Figure 1.In this case fluid under pressure is substituted for the screw 34. Apiston is slidably mounted in a bore 5| in member 30. Said fluid issupplied from any suitable source such as a pump to the lower end ofsaid bore. The pressure in said racess may be constant or it may be usedonly when it is desired to adjust the wheel base 20.

In Figure 3 is shown a further modification. A disk is inserted into therecess in plate 40 occupied by bearing ring 44 in Figures 1 and 2. Amember 6| having a single bore 62 takes the place of member 30 inFigures 1 and 2. A piston in this respect.

- said guide surfaces.

63 attached to or formed on the under side of disk 60 is slidablymounted in said bore 62.

In this case the fluid under pressure takes the place of both the screwand the anti-friction bearing and the base 20 may be adjusted angularlywhile floating on the body of fluid under pressure in bore 62. Fluidunder pressure is supplied to bore 62 in the same manner as shown inFigure 2.

Obviously, types of bearings other than roller bearings may be used forsupporting the base member. The invention is therefore notlimited Weclaim:

1. In a grinding machine, a bed, a support member on said bed having abroad bearing surface on the under side thereof for distributing theweight of said support member over'a corresponding surface on said bed,spaced guide surfaces on said support member, a grinding wheel base;having, correspondingly spaced guide surfaces for slidably mounting saidbase on said support member, an anti-friction bearing mounted'forvertical movement in said bed beneath the center of said support member,springs beneath said bearing, means for loading said springs so as toforce said bearing upwardly, and means for preventing deflection ofsaidsupport member and said guide surfaces thereon due to the vertical forceexerted on said bearing including an intermediate member mounted on saidbearing and engaging said support member only at points spaced at leastby the same amount as the weight of said support member over acorrespondingsurface on said bed, spaced guide surfaces on said supportmember, a grinding wheel 4 base having correspondingly spaced guidemembers for slidably mounting said base on said support member, ananti-friction bearing mounted -for vertical movement in said bed, meansfor urging said bearing upwardly, and means including a plate betweensaid bearing and said support member having a raised portionaround theouter edgefor engaging said support member to distribute the forceexerted by said urging means and said bearing to points adjacent theouter edges of said support member whereby to prevent deflection of saidsupport member and said guide surfaces.

WALTER. S. KLAY.

RALPH E. PRICE.

REFERENCES CITED The following references are of record in the flle ofthis patent: v UNITED STATES PATENTS 'Number Name Date- 856,662 SmithJune 11, 1907 1,151,785 Hitchock Aug- 31,1915 1,232,999 Tolles July 10,1917 1,391,039 Beach Sept. 20, 1921 1,551,739 Gough et al. Sept. 1,1925I 1,758,534 Porter .-May 13,- 1930 1,836,482 Lyon et al. Dec. 15 19312,135,639 Gorham 1 Nov 8, 1938 2,208,499 Fiedler; July 16, 19402,335,712 Vitale Nov. 30, 1943 2,419,926 Waldron Apr. 29, 1947 2,429,710DAvaucourt Oct. 28, 1947 FOREIGN PATENTS p Number Country I Date110,527v Great Britain' Oct. 27, 1917 287,726

Great Britain Mar. 29,1928

